package com.nba.common.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
 * <pre>
 * Java 常用流处理工具
 * </pre>
 *
 */
public class StreamUtils {
    /**
     * 将流另存为文件
     *
     * @param is
     * @param outfile
     */
    public void streamSaveAsFile(InputStream is, File outfile) {
        FileOutputStream fos = null;
        try {
            File file = outfile;
            fos = new FileOutputStream(file);
            byte[] buffer = new byte[1024];
            int len;
            while((len = is.read(buffer)) > 0){
                fos.write(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        } finally {
            try {
                is.close();
                fos.close();
            } catch (Exception e2) {
                e2.printStackTrace();
                throw new RuntimeException(e2);
            }
        }
    }
    /**
     * Read an input stream into a string
     * @param in
     * @return
     * @throws IOException
     */
    static public String streamToString(InputStream in) throws IOException {
        StringBuffer out = new StringBuffer();
        byte[] b = new byte[4096];
        for (int n; (n = in.read(b)) != -1;) {
            out.append(new String(b, 0, n));
        }
        return out.toString();
    }
    public static byte[] stream2Byte(InputStream is) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int len = 0;
        byte[] b = new byte[1024];
        while ((len = is.read(b, 0, b.length)) != -1) {                    
            baos.write(b, 0, len);
        }
        byte[] buffer =  baos.toByteArray();
        return buffer;
    }
    /**
     * @方法功能 InputStream 转为 byte
     * @param InputStream
     * @return 字节数组
     * @throws Exception
     */ 
    public static byte[] inputStream2Byte(InputStream inStream) 
            throws Exception { 
        int count = 0; 
        while (count == 0) { 
            count = inStream.available(); 
        } 
        byte[] b = new byte[count]; 
        inStream.read(b); 
        return b; 
    } 
    /**
     * @方法功能 byte 转为 InputStream
     * @param 字节数组
     * @return InputStream
     * @throws Exception
     */ 
    public static InputStream byte2InputStream(byte[] b) throws Exception { 
        InputStream is = new ByteArrayInputStream(b); 
        return is; 
    } 
    /**
     * @功能 短整型与字节的转换
     * @param 短整型
     * @return 两位的字节数组
     */ 
    public static byte[] shortToByte(short number) { 
        int temp = number; 
        byte[] b = new byte[2]; 
        for (int i = 0; i < b.length; i++) { 
            b[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位 
            temp = temp >> 8; // 向右移8位 
        } 
        return b; 
    } 
    /**
     * @功能 字节的转换与短整型
     * @param 两位的字节数组
     * @return 短整型
     */ 
    public static short byteToShort(byte[] b) { 
        short s = 0; 
        short s0 = (short) (b[0] & 0xff);// 最低位 
        short s1 = (short) (b[1] & 0xff); 
        s1 <<= 8; 
        s = (short) (s0 | s1); 
        return s; 
    } 
    /**
     * @方法功能 整型与字节数组的转换
     * @param 整型
     * @return 四位的字节数组
     */ 
    public static byte[] intToByte(int i) { 
        byte[] bt = new byte[4]; 
        bt[0] = (byte) (0xff & i); 
        bt[1] = (byte) ((0xff00 & i) >> 8); 
        bt[2] = (byte) ((0xff0000 & i) >> 16); 
        bt[3] = (byte) ((0xff000000 & i) >> 24); 
        return bt; 
    } 
    /**
     * @方法功能 字节数组和整型的转换
     * @param 字节数组
     * @return 整型
     */ 
    public static int bytesToInt(byte[] bytes) { 
        int num = bytes[0] & 0xFF; 
        num |= ((bytes[1] << 8) & 0xFF00); 
        num |= ((bytes[2] << 16) & 0xFF0000); 
        num |= ((bytes[3] << 24) & 0xFF000000); 
        return num; 
    } 
    /**
     * @方法功能 字节数组和长整型的转换
     * @param 字节数组
     * @return 长整型
     */ 
    public static byte[] longToByte(long number) { 
        long temp = number; 
        byte[] b = new byte[8]; 
        for (int i = 0; i < b.length; i++) { 
            b[i] = new Long(temp & 0xff).byteValue(); 
            // 将最低位保存在最低位 
            temp = temp >> 8; 
            // 向右移8位 
        } 
        return b; 
    } 
   
    /**
     * @方法功能 字节数组和长整型的转换
     * @param 字节数组
     * @return 长整型
     */ 
    public static long byteToLong(byte[] b) { 
        long s = 0; 
        long s0 = b[0] & 0xff;// 最低位 
        long s1 = b[1] & 0xff; 
        long s2 = b[2] & 0xff; 
        long s3 = b[3] & 0xff; 
        long s4 = b[4] & 0xff;// 最低位 
        long s5 = b[5] & 0xff; 
        long s6 = b[6] & 0xff; 
        long s7 = b[7] & 0xff; // s0不变 
        s1 <<= 8; 
        s2 <<= 16; 
        s3 <<= 24; 
        s4 <<= 8 * 4; 
        s5 <<= 8 * 5; 
        s6 <<= 8 * 6; 
        s7 <<= 8 * 7; 
        s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7; 
        return s; 
    } 
}
